What is an old technique for providing walkways on BUR roofs?

Constructing wood walkways, referred to as duck boards, is an old technique utilized for creating walkways on Built-Up Roofing (BUR) roofs. This method involves laying wooden planks or boards directly on the roof surface, which helps distribute the weight of personnel and equipment. Duck boards serve the dual purpose of protecting the roofing materials from potential damage while providing a stable, slip-resistant pathway for maintenance workers and other personnel accessing the roof.

Traditional use of duck boards also permits better drainage and airflow beneath the wood, as it elevates the walkway above the roof surface, minimizing the risk of water pooling. This method has been favored historically due to the availability of materials and the simplicity of construction, making it an effective and widely accepted solution for rooftop access.